Hi An ice skater speeds up from 3m/s to 7m/s in 1.6 seconds. What is her acceleration?

+0.2 m/s squared
-0.2 m/s squared
+1.8 m/s squared
-1.8 m/s squared
+2.5 m/s squared
-2.5 m/s squared

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i dont know sorry

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did you get the answer yet?

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hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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